Montezuma upgrades WA manganese mine


Montezuma Mining has upgraded its 100 per cent-owned Yanneri Ridge manganese facility in Butcherbird, Western Australia — the largest onshore facility of its type in the country — following optimistic test results that have exceeded expectations.

In 2011, the company’s initial deposit reports suggested 15.8 million tonnes of resources with 9.4 per cent magnesium yield. The latest findings infer 22.5 million tonnes at 12 per cent manganate yield, better than previous expectations.

The company has reported this as a 2.7 per cent increase in total contained manganese over its previous estimate in 2011.

However, the actual increase in expected manganate yield works out at around 1.2 million more tonnes than the previous estimate, representing a 45 per cent increase in manganate yield when compared with JORC 2004 mineral resource estimates.

The Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (JORC) is a mandatory code for the classification and report of mining exploration results, and has been in use since 1989.

This bump is enough for Montezuma to update its resource estimates from the older JORC 2004 standard to the latest JORC 2012 standard.

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